# Copyright 2014 Google Inc. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import ctypes

from . import number_types as N
from . import packer
from .compat import memoryview_type


def Get(packer_type, buf, head):
    """ Get decodes a value at buf[head:] using `packer_type`. """
    return packer_type.unpack_from(memoryview_type(buf), head)[0]


def Write(packer_type, buf, head, n):
    """ Write encodes `n` at buf[head:] using `packer_type`. """
    packer_type.pack_into(buf, head, n)
